/ 2 \ 2*c*(-1 + c)*\-1 + c - c/
/ ___\ / ___\ | 1 \/ 5 | | 1 \/ 5 | c*(c - 1)*|c + - - + -----|*|c + - - - -----| \ 2 2 / \ 2 2 /
/ 2 \ 2*c*\1 + c *(-2 + c)/